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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ef37b073e327201744a3bcb2587c6d69f7ab1e15146805201044119671e65f' 
  AND token = 'I+J7JoHHz4g6vdDXMuxHzfP5g+4lfJSj+G5zkDxGa9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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