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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430488cf6adeb7b09ecf152dc31232b8129e8f47860c90b4bc5af52e64dfe98a' 
  AND token = 'zr83Z2eAlp9gysR7rrQU0YMq7pxd0N/UzanSm3EhclA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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