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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c3bc42f4659d863f5d63616a1054e7bd96d3fe74970b88cab86c457b364f3de' 
  AND token = 'Jn6iPaGZJPSBjpG7RpR5A93i8ez9h/GnscIyxWNd81M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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