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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19233c13e7946b76e4698516af408a13b59e55e8110887de4a5299d7975b088c' 
  AND token = 'wkQALK/IwZdBtMkaGDFJhhsBDFIbUXRpre9diQYA27o=' 
  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"
    }
  }
}