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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7e435c35a18014cf255682cf7682cc3bffcfdf792bb1d4a9e7d4de3cb23b1d8' 
  AND token = 'a2Nye/XWHYdDTG/VhruX9C0DN+x8Pc4LxHZZiBkJOrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}