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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe8e5754777a7aeaadbf4798bf805890581801e2589502f88f17e5fae2c61fc0' 
  AND token = 'aqTxM/O8npuU9rTs1i8mJ66mqP7AAN9+1T8ZtWXjqSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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