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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2ed878236c7b644f4f1b04e8735d9b59aebda3dc7e39af8fd6c622bb16d6ebe' 
  AND token = 'cLWVsT8o5t4c6vg5NhVS1eli+tqyowE7LUM1h2b+2no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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