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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2dcc8bcad3437957e56cab757c1544ba2aace06377bfc754f289110adf3d6cc' 
  AND token = 'ezNwn4yyFmF4+bYRQ1+RN1hfEq3yv9XxKATM0u5QrxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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