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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9009c91fce9a303e775dc384b8a3ce686090be4b7ef8abc14567014072025069' 
  AND token = '1C+EIe3ddLwIupZWX0N6D3XJTVTS7+t+n1fFs7OPzso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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