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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0d107cf4e07f41a4266df8eec9c369360154bde1e183bae49b05d32d4e4b4c1' 
  AND token = 'A0TtLd9BBD6iZPXRATJDMLuJhlCybys1CQa1PoOt59I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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