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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb0d6e5f1702fb08c5ee6a1396b2032756fba91d5f76935343abd3fb1006c0e' 
  AND token = 'e7iFQVsVK/9nJssAsxZsv9DzXrs7yilHO3vjrKSFCoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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