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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4cb7a7aaa7dd9c979a27fc2b4811c72ec3a1e815b79a67c44e0e467add09a3c' 
  AND token = 'xmhBQupKRa0oYEshhLVwOOZR02Ho44bOQVoN/wvth9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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