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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc86be76752eba04e739a29b201e2a898f38539fb7056eae5ba39e30de5d395' 
  AND token = '2aoxwebTRnJRtlCmuWS47FHxNgT7uXlUEs0wU6c6k74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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