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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad584f123b1fc4cc6cc30edf896cba1a0e878f91161f2d9b5dcfc3c9c696b565' 
  AND token = '3jnRTIVp2/TB8Gcpq+5J5AwKpQg8FaWVmLqGNONf3KE=' 
  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"
    }
  }
}