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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf3cce215e2499b3cc93f42c74f34ce3b195afa16804bcc6cbe5b3db0dff046' 
  AND token = 'eg1SiS6q+EIZbvqPhrMsFF53gvACssJ3tRsl3x1K8rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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