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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7da274fc42732f0c7ed9fa9114cc3eb0d18ddeb433f99c80b7671fd9982895' 
  AND token = '/KX6Lh0yv2iavYEBT5LtMt9BWfZ9kkmsY4yz6o3zbpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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