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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08029a9fe0abdda4fd787e31bcaeb6d7dd37674d6d4a417f1fe0e21420f1cb48' 
  AND token = 'lmyyU20xAVsW5SHGmh0ddSZ7r5Z7+hGYQRxBjXBh//k=' 
  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"
    }
  }
}