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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04cbe984f58e8c1bd57167f9db5044f5c7ce0c2404c4da01fdc54363c828dd41' 
  AND token = 'MbN/q6biG8QQRTt4cKXkS1In8x9H04KdFF/kXNWD2Uk=' 
  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"
    }
  }
}