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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d11e9fa7011118968e18671dedf614e9a19eabbc2f0f151a8b074510d40121' 
  AND token = 'jC8RVehrSlFWo/OmCfxPjYajfvuKxRCkzDX9K/j5hr4=' 
  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"
    }
  }
}