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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e7c79a6cd6a847524962eef4b67f41866dd0b488f9032999a8040c7ab93e9ef' 
  AND token = 'QxBSiJEXmB9j73x81f7QXbaSmt1JABDQFU2o8nJY6dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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