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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd217bcaf4ed2edae0717e6e24a4b2404124d65277e90149c46fe6457a7ce4134' 
  AND token = 'r0S4dBF5hL2r9dFtScWbgWEFXt3gfR+MB3r7tIziUek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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