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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a673ed8aabc3d68c0c4356ec210f01729351041f90713ec1d10636f25503253c' 
  AND token = 'ikvMH7x8t73nXRVEvS4HFhi4LhM38neGuH8jWrNf1I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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