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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb72a3826b60a83381dd315dbdfbab154ad03203df4d407329301ac76d271f1' 
  AND token = '23ex1GKAMg4KDfzSAjtr/f+Hwj1pyN1jt67N9zYCGYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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