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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c29df4130c33aeb175251546dc52924ce2d8a48ec9448e0c4751d2a221ebcf22' 
  AND token = '3kPFZrmgeje8mJDp/UlBJZ/b+5tJLb4p422p4xiBMXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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