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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '097c72c967449edad1d7844caf768f46f45d8a6d11948a63fe0887c485f11571' 
  AND token = 'jtwg5k5QAN0J/R6WJ1yktrC7IV34Zpn1geNROwdqLOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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