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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e28ebed2e3d40e79bdff5d4d486ab49089ebbef01b98ae9c2f102b96d40a51' 
  AND token = 'Ktp+UC5Kd7dy01GOzU2mRDG8YpybQGP0hegLUFqZ2S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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