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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12e1cced6d2d7db84e5f23c5ae400b0affd45cfd023b8f42351576f8252b3b2a' 
  AND token = 'jja6Np6PkGtDJTCWaPmzA2G8XZVHJZFsRwT3VFL0El0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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