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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aee1da4478b6f3e7f7df3ba7f3d1815cfb0fe1858965c6688dd6aa796d25e6c' 
  AND token = 'v3za1VdSxc/A9G3JZ28UPW3+llN9nZBm9cNP3rZwIs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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