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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36748a453385494de4c1f87edea932f2d99cef5d04450f176fb3c92b7095c8d3' 
  AND token = 'bN/0cuMN/r0St6F1W0n9+88X/wRS2kYlZi7gUyQ7kco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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