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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ca086003d575f2db9d2c37ad5db852bb2b92a3343abb3c3892d07d0bc41bfc' 
  AND token = '0HH+Y4wS/gXv5qiyO/tRqFLSnRoOPgXq5O3AIb8UC5o=' 
  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"
    }
  }
}