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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '139cc30b2bfb4bcd7acc8a03fc9fb1f2cb02316c1d97d18de02785dca7918dc1' 
  AND token = 'Qgk/hh/2uKEX2+wjWdu8z9DtkCZm1/NUuEwWPnwxLwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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