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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ad9405399d1d615ea7fcd5841eb88a68d791b4c620241bea23c18b8d120ae2b' 
  AND token = '58SDXaP+ACiJ+aNpnhIgNYafPKDOQWRwmVXbk3dj7kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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