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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd3e0dd63d8a32271864e96d921f14bebed426876503f10f8396141bff9c8142' 
  AND token = 'Jl/n2GzpBB/lY5glHmSCHQwTkiUiTa851GkgR9dTTSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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