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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a951e6e7c7fd794d2a5db9f7fc1cb14d1e9deef594da610157b0c45b6742f062' 
  AND token = 'nInRUwFfg+ab7rNPjKVXcMr2GX7zxbZXOQSpM7d3u7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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