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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d16579f76d68ddd516e13fa56e221ce51c8a8175779474b44ed8144d31cb15' 
  AND token = 'Wkdq1W4o7gWII+iSeM5oxxbq3KFSF4fa2yoRFT1a0d8=' 
  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"
    }
  }
}