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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec76fbeda76ac48102e2237eb0717f61e085efd0902e3a8fbdb208fe490a472' 
  AND token = 'L5cH9i40mW5p1+1FcmLfzexM/7+NcnPGIKS9IF59cDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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