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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae41ff29d47847378b71d988b18393e33cdd7389a2c7040ad547f9ae0ab00f2' 
  AND token = 'j8Uvl9lqGiZk3KSo/gkcYfMae5uzfxx51Sfy0P31Goo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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