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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73658a3fdfa77e5ea8ff8a01942b7c4ecea6f9f8b1863b0fc2f720bc12b7a84a' 
  AND token = 'VoZ/dMHyJ4Uj19g+wrNJeTPBi8B5Rlw8XsMTuPNz5Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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