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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50b2352028e50818de98ac3ea84ac4e8799b86ec3153f3a1c37a6a8b443221d1' 
  AND token = '9sB2206TlXRzNroezli7c6d9cL4RBtW/appylT16I3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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