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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d54d3aa5918ed47ed6e9b5fa1997fe7bf1f7801c7861bd59f5d9771126ec00' 
  AND token = 'eew19fqnHZF5fVFmtcAciykkrNRAHvquYQx5hH4pRws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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