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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48c60f8435b94f6b6eaa130f97ed4acbd6d2636d3a6a7990a65665bc332fa1da' 
  AND token = 'TA2VqGNU46ByPUzrJbSRfm0MM1lVpjJ6f/l8slsKKjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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