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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db19f66aa56fefcd7d6218e20e4c56a8e56fbc41b68fef029856e460fcdcec8' 
  AND token = 'ldyAS0bTZ139kS6H6SxbV8RlDLplvC4ooZuLX0FOtCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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