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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde75432d9afcbe8286151fcf8cb5c97a844af9fe98bd6ebb6373b65c5654443' 
  AND token = 'EAuR5O7Ky+hPPa5DuS6BX2KXiYSynmGyEOSiyDpnz/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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