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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a28f99ec25045a1614f242a10392ddb82612e273afd40b2521638b8f79ca8b0b' 
  AND token = '05A4B3HgR4k0Fs8Elq4WJROfnFd31C388Gb+aznH1w8=' 
  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"
    }
  }
}