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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712d19c08cb833d565a07e089644aa2f6ee0896593e35b9ead3d4d47446d693e' 
  AND token = 'GQkDZp2H67fhRjhSaA2mRGu9iKDTu8znbK6FuMrkQMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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