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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '104666c6c412b33895ca93b8914863e44d2534b52c89f82f6bb9dc44ed2190e7' 
  AND token = 'pNCm0Q2t+x0RTMuAPE/cG023js60choZYN0+0Ka9Ky0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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