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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd671ac0dd4fdc37d037512e0a25a62f1758d5bb9e669983e4a5c5b39054e08d2' 
  AND token = 'wzhEif+4fzJuohffYXwfBJqpzc/NUcRz+D/kUetlDkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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