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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd494f268f1e9febdcc5113bdb4932b365d2fb6cc9f1b47c6a4b5abb02528b244' 
  AND token = 'HEvycxFOj7f65sF8Xj3ZeLv1iefZxkK2k7+uX0t1S9g=' 
  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"
    }
  }
}