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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2826900b1d9a2f02f3f210fe879452ccfd73b5b5344c3376de866c26298cde7' 
  AND token = 'fUkqd8rneIYhJ0Jl2ZdnxS0/po2IZs+nxbpazjlyToE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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