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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f1ed199b3c80cbb5cfcf10c806962351f8dd389cdcba3332471273ae654d5c' 
  AND token = '864hDin0hvrsTRb65HJfvqr+GUUk7NrDMa2Faz/BZI8=' 
  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"
    }
  }
}