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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94fcd00e0022de236b72c731674e182916078389936e9e3b3fe91abd2115135f' 
  AND token = 'dyxqoSTLzoJ42EL6qcsucQK4UasWaovXzJ8h877UtyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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