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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca7767e5740f298e9ef07f7dcc689757056462034c8bf76543b2b77971b40fd1' 
  AND token = '2jexSsmccds/5IZKvOCRzakMdtMuQV6RXKG5Krdsw3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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