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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c20b6121404ff3f660e804c25b43e9334b9dce292e8c175d95f142c524501e0' 
  AND token = 'vz3X25vPz5SWTltmdRtkls3VMYxX+7F4Szy9arxWMFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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