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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '848b677e947d28d7f729d73c10859c81642f16ab044c6c78a485921ab633a52c' 
  AND token = 'oLfwly87DTEz8HkipvAe9s9PY242sPA0jarjjrsOKbk=' 
  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"
    }
  }
}