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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f05f61c9b9a191a0211afa0a52f7758328b629f0e6e752da7648e273ed9dfd' 
  AND token = 'sy7ET9TNppVfS1txxL4fmdlKSAnq6UD9RQSyUvepgUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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